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Fair Value Measurements (Financial Instruments Measured At Fair Value On Recurring Basis) (Detail) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value $ 91,071 $ 90,699
Equity securities, at fair value 4,405 4,027
Short-term investments 3,735 4,345
Other investments, at fair value 8,636 7,945
Securities lending collateral 2,076 1,844
U.S. Treasury / Agency    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 2,527 2,670
Non-U.S.    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 26,166 26,354
Corporate and asset-backed securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 36,400 36,331
Mortgage-backed securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 19,437 18,470
Municipal    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 6,541 6,874
Fair Value, Recurring [Member] | Level 1    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 2,044 2,148
Equity securities, at fair value 4,330 3,954
Short-term investments 2,279 2,866
Other investments, at fair value 421 434 [1]
Securities lending collateral 0 0
Investment derivative instruments, assets 69 35
Other Derivative Instruments Fair Value 2  
Separate Account Asset 4,493 4,264
Total assets measured at fair value 13,638 [2] 13,701 [1]
Investment derivative instruments, liabilities 79 52
Other derivative instruments, liability 7 17
Liabilities Related to Investment Contracts, Fair Value Disclosure 86 69
Fair Value, Recurring [Member] | Level 1 | U.S. Treasury / Agency    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 2,044 2,148
Fair Value, Recurring [Member] | Level 1 | Non-U.S.    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 0 0
Fair Value, Recurring [Member] | Level 1 | Corporate and asset-backed securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 0 0
Fair Value, Recurring [Member] | Level 1 | Mortgage-backed securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 0 0
Fair Value, Recurring [Member] | Level 1 | Municipal    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 0 0
Fair Value, Recurring [Member] | Level 1 | GLB    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross 0 0 [3]
Fair Value, Recurring [Member] | Level 2    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 86,714 86,372
Equity securities, at fair value 0 0
Short-term investments 1,455 1,474
Other investments, at fair value 446 438 [1]
Securities lending collateral 2,076 1,844
Investment derivative instruments, assets 0 0
Other Derivative Instruments Fair Value 0  
Separate Account Asset 115 124
Total assets measured at fair value 90,806 [2] 90,252 [1]
Investment derivative instruments, liabilities 0 0
Other derivative instruments, liability 0 0
Liabilities Related to Investment Contracts, Fair Value Disclosure 0 0
Fair Value, Recurring [Member] | Level 2 | U.S. Treasury / Agency    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 483 522
Fair Value, Recurring [Member] | Level 2 | Non-U.S.    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 25,516 25,808
Fair Value, Recurring [Member] | Level 2 | Corporate and asset-backed securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 34,788 34,758
Fair Value, Recurring [Member] | Level 2 | Mortgage-backed securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 19,386 18,410
Fair Value, Recurring [Member] | Level 2 | Municipal    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 6,541 6,874
Fair Value, Recurring [Member] | Level 2 | GLB    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross 0 0 [3]
Fair Value, Recurring [Member] | Level 3    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 2,313 2,179
Equity securities, at fair value 75 73
Short-term investments 1 5
Other investments, at fair value 10 10 [1]
Securities lending collateral 0 0
Investment derivative instruments, assets 0 0
Other Derivative Instruments Fair Value 0  
Separate Account Asset 0 0
Total assets measured at fair value 2,399 [2] 2,267 [1]
Investment derivative instruments, liabilities 0 0
Other derivative instruments, liability 0 0
Liabilities Related to Investment Contracts, Fair Value Disclosure 760 1,089
Fair Value, Recurring [Member] | Level 3 | U.S. Treasury / Agency    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 0 0
Fair Value, Recurring [Member] | Level 3 | Non-U.S.    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 650 546
Fair Value, Recurring [Member] | Level 3 | Corporate and asset-backed securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 1,612 1,573
Fair Value, Recurring [Member] | Level 3 | Mortgage-backed securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 51 60
Fair Value, Recurring [Member] | Level 3 | Municipal    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 0 0
Fair Value, Recurring [Member] | Level 3 | GLB    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross 760 1,089 [3]
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 91,071 90,699
Equity securities, at fair value 4,405 4,027
Short-term investments 3,735 4,345
Other investments, at fair value 877 882 [1]
Securities lending collateral 2,076 1,844
Investment derivative instruments, assets 69 35
Other Derivative Instruments Fair Value 2  
Separate Account Asset 4,608 4,388
Total assets measured at fair value 106,843 [2] 106,220 [1]
Investment derivative instruments, liabilities 79 52
Other derivative instruments, liability 7 17
Liabilities Related to Investment Contracts, Fair Value Disclosure 846 1,158
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | U.S. Treasury / Agency    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 2,527 2,670
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Non-U.S.    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 26,166 26,354
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Corporate and asset-backed securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 36,400 36,331
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Mortgage-backed securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 19,437 18,470
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Municipal    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 6,541 6,874
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | GLB    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross 760 1,089 [3]
Investment Funds Limited Partnerships Partially Owned Investment Companies Fair Value [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Other investments, at fair value 7,457 6,770
Policy Loans [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Other investments, at fair value 232 233
Other Investments [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Other investments, at fair value $ 70 $ 60
[1] Excluded from the table above are partially-owned investments, investment funds, and limited partnerships of $6,770 million, policy loans of $233 million and other investments of $60 million at December 31, 2020 measured using NAV as a practical expedient.
[2] Excluded from the table above are partially-owned investments, investment funds, and limited partnerships of $7,457 million, policy loans of $232 million and other investments of $70 million at March 31, 2021 measured using NAV as a practical expedient.
[3] Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value.